Aethue weightson



(No`Mode1.\

' A. WRIGHTSON.

1 KNITTING MAGHIlsIE.A 1

No. 261,508. Patented July 18, 1882.

UNITED STATES APATENT OFFICEa ARTHUR WRIGHTSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN OR OF ONE-HALF TO CHARLES SHIRTOLIFF, OF SAME PLAGE.

KNITTING- SPECIFICATION forming' part of Letters Patent No. 261,508, dated July 18, 1882.

Application filed April 15, 1882. (No model.) Y

To all whom it may concern Be it known that I, ARTHUR WnrGnTsoN,

a citizen of the United States, and a resident.

of Philadelphia, Pennsylvania, have invented an Improvement in Knitting- Machines, of

which the following is a specitication.

My invention relates to an improvement in that class of knitting-machines Vin which portions ot the cams are movable for the purpose ro of varying the character ot' the work produced, the object of my invention being to provide means t'or readily shifting these movable portions of the cams from an operative to au inoperative position. and vice versa, and

to retain them in position after adjustment.

In the accompanyingv drawings, Figure l is a perspective View of the head ot a circularknitting machine with my invention applied thereto; Fig. 2, a sectional View of the head 2o on a larger scale; and Fig. 3, a perspective view of one of the cams and its adjusting and retaining device, the parts being shown detached from each other.

A is the circular frame or head of the machine, to the inside ot' which are bolted the twosets of cams a and b, which act upon the jacks ot theneedles, as usual, the cams a sorving to depress and the cams b to elevate the needles.

3o Each cam has a central sliding block, x, which can be moved to such a position as to form a continuation of the acting face of the cam, or can be retracted, so that it fails to opcrate on the jacks of the needles, cams ot' this sortbeingcommonlyusedinknitting-machines for the production ot' what is known as tuckwork.77

The movable portion x of each cam has a stem, el, which projects through avertical slot, 4o f, in the headA, each stem having an enlarged head, g,which is contained within the recessed -end of a bolt, h, the latter being adapted to slidek on the stem, and being acted upon by a spring, t', interposed between the head of the 4 5 stem and the bottom of the recess in the bolt h, the tendency of this spring being to thrust the bolt inward against the' head A.

In the outer surface of the head A, at one end of each slot f, is a cirdular recess, m, these recesses being adapted for' the reception of the 5o inner ends of the bolts h when the stems d occupy the ends of the lots adjacent to the recesses, the sliding po tions ot' the cams in suchcases being in op rative position. The engagement of the bol s with the recesses m thus serves to lock the slides x firmly in position; but said slides an be readily shifted, when desired,by simply withdrawing the bolts h from the recesses m and moving the stems d to the opposite ends of the slotsf, the action 6o of the springs t' then causing the inner ends ofthe bolts to bear iirmly upon the surface ot' the head A,so that the bolts by frictional contact with the head'prevent the accidental jarring of the slides .r back into an operative position.

The adjusting and retaining device above described is simple and compact, and does not interfere with the thread-guides or other attachments to the head. 7o

The ends of the bolts need not necessarily be recessed for the reception ot' the springs i and the enlargedheads ofthe stems; but this construction is preferred, as it renders the device more compact than it' the springs were 75 outside of the ends of the bolts.

In the drawings I have shown all of the cams provided with slides but in solne machines a portion only'of the cams may be thus constructed, the other cams being of theusual 8o character.

I claim as my invention- The combination of the head A, having slots f, with recesses m, the cams having slides x, with stems d, the bolts h, and the springs fi, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR WRIGHTSON. 

